302 firing order

[brambo2008]

Good evening,


Can someone tell me the firing order for a 1980 302?

1-5-3-4 6-2-7-8?

Thanks...

 

[Viperwolf1]

Close. 15426378

 

[TBS-POPS]

no,, up to and including 84 is 1-5-4-2-6-3-7-8..... ccw rotation on dist cap

 

[Steve83]

Read this TSB:

 

[brambo2008]

O.K

lol. that is what is scaring me. I googled it and 3 or 4 different people had 3 to 4 different orders too! Maybe this will help, I have 1974 ford bronco with a rebuild 1980 302 an after market MSD dist. I changed all the spark plugs and replaced the cap and rotor. I marked all cables the same as they were before. I thought that this would fix my problem of what seem like a miss or a bad plug. The plugs were pretty bad and not one was set at .35? It is smother then it was, it when I take off it is a little rough so I thought I would google the firing order and could not find a true answer. Would it run kind of smooth if the wire were cross?

Thanks...

 

[brambo2008]

Bump Anyone?

 

[DirtDonk]

Well, no matter how many answers you get, there were only two different firing orders used on the 302/5.0 engines, so you have a 50/50 chance of being right. And it's easy enough to change over the four wires to check to see if it runs better with the other firing order.
Did this start all of a sudden, or has it been doing it all along? If just recent, then it's a good bet it's not your firing order causing the rough running.

All the different answers you get are probably due to the confusion about just when Ford changed the firing order, because not all vehicles got the change at the same time oddly enough.
As I think we can see by Steve's TSB (technical service bulletin), cars and trucks got the new order at different years. His says that the old firing order was used, in trucks at least, all the way to '93. I'm pretty sure that there were cars running around with the new order well before that.
See? Easy. To get confused at least.

As mentioned in Steve's TSB and by the others, yours should still be the earlier 15426378 order.
But did you replace the cam during the rebuild? If it was replaced with a 351 cam for some reason (not common, but it could happen), then you'd have to use the other firing order, since that's what all 351W engines used throughout their run.

You're saying that you're already using the 15426378 firing order then?
Maybe leave it that way for now and check for something else, like vacuum leaks and such. A leak, or an over-lean mixture from the carb can cause a lean-misfire, which would give you an inconsistently rougher running engine because the spark can't ignite the mixture each and every time.
You've got a nice distributor, but have you replace the cap and rotor lately? Cleaned the insides to make sure the stator and pickup are talking to each other clearly?
Checked your timing during all this?

Unfortunately, rough running can be from about 143 1/2 causes. And lucky you gets to check them all out!
Good luck.

Paul